MAX192

Features:

© 8-Channel Single-Ended or 4-Channel Differential Inputs
© Single +5V Operation
© Low Power: 1.5mA (operating) 2A (power-down)
© Internal Track/Hold, 133kHz Sampling Rate
© Internal 4.096V Reference
© 4-Wire Serial Interface is Compatible with SPI, QSPI, Microwire, and TMS320
© 20-Pin DIP, SO, SSOP Packages
© Pin-Compatible 12-Bit Upgrade (MAX186/MAX188)


Application

Automotive
Pen-Entry Systems
Consumer Electronics
Portable Data Logging
Robotics
Battery-Powered Instruments, Battery Management
Medical Instruments


Pinout




Specifications

VDD to AGND......................................................... -0.3V to +6V
AGND to DGND.................................................... -0.3V to +0.3V
CH0CH7 to AGND, DGND ...................... -0.3V to (VDD + 0.3V)
CH0CH7 Total Input Current...................................... ±20mA
VREF to AGND .......................................... -0.3V to (VDD + 0.3V)
REFADJ to AGND...................................... -0.3V to (VDD + 0.3V)
Digital Inputs to DGND.............................. -0.3V to (VDD + 0.3V)
Digital Outputs to DGND........................... -0.3V to (VDD + 0.3V)
Digital Output Sink Current ...............................................25mA
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) ......... 889mW
SO (derate 10.00mW/°C above +70°C)...................... 800mW
SSOP (derate 8.00mW/°C above +70°C) ................... 640mW
CERDIP (derate 11.11mW/°C above +70°C).............. 889mW
Operating Temperature Ranges
MAX192_C_P ..................................................... 0°C to +70°C
MAX192_E_P .................................................. -40°C to +85°C
MAX192_MJP ................................................. -55°C to +125°C
Storage Temperature Range ........................ -60°C to +150°C
Lead Temperature (soldering, 10sec) .......................... +300°C

Description

The MAX192 is a low-cost, 10-bit data-acquisition system that combines an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and ultra-low power consumption. The device operates with a single +5V supply. The analog inputs are software configurable for single-ended and differential (unipolar/bipolar) operation.

The 4-wire serial interface connects directly to SPI™, QSPI™, and Microwire™ devices, without using external logic. A serial strobe output allows direct connection to TMS320 family digital signal processors. The MAX192 uses either the internal clock or an external serialinterface clock to perform successive approximation A/D conversions. The serial interface can operate beyond 4MHz when the internal clock is used. The MAX192 has an internal 4.096V reference with a drift of ±30ppm typical. A reference-buffer amplifier simplifies gain trim and two sub-LSBs reduce quantization errors.

The MAX192 provides a hardwired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the device, and the quick turn-on time allows the MAX192 to be shut down between conversions. By powering down between conversions, supply current can be cut to under 10A at reduced sampling rates.

The MAX192 is available in 20-pin DIP and SO packages, and in a shrink-small-outline package (SSOP) that occupies 30% less area than an 8-pin DIP. The
data format provides hardware and software compatibilitywith the MAX186/MAX188. For anti-aliasing filters, consult the data sheets for the MAX291MAX297.